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16regc
2011 Jan 19
0
[LLVMdev] tied registers
Hi,
I wonder if there is a simple way to define a 3-address instruction taking 4 operands, ie a
32regA = MAC (32regB, 16regC, 16regD) // widening mac instruction
Regs A and B should be handled like "src1 = dst", but this does not work, I get odd results.
I wonder also how to generally select instructions when the widths of the input operands differ like this.
Thanks,
Jonas
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